60-GHz LTCC Antenna Arrays - Ultra-Wideband and 60 GHz Communications for Biomedical Applications - page 223

Fig. 23 Geometry of the proposed LTCC dual-polarized L-probe patch antenna element. a 3D view,
b To p view, c Side view

Table 2 Detailed dual-polarized antenna element dimensions
Parameters

Dimensions
(mm)

Parameters Dimensions

(mm)

Parameters Dimensions

(mm)

w 0.7 w 1 0.1 l 0.7

l 1 0.25 l 2 0.3 cl 2.7

cd 0.25 h 1.2 h 1 0.7

h 2 0.6 h 3 0.1 h 4 0.3

to 74 GHz for Port II (| S 22 | < 10 dB), respectively. Compared with the element

without the open-ended SIC, the impedance bandwidth of the antenna element with
the open-ended SIC is improved slightly. The simulated | S 21 | of the proposed antenna
element with the open-ended SICs is less than

−

25 dB form 56 to 65 GHz.
Figure 25 shows the simulated radiation pattern at 60 GHz for the proposed
antenna element with the open-ended SIC. For Port I, the 3-dB beamwidths are 95
and 75 ◦ in XoZ-plane and YoZ-plane, respectively. The corresponding values for
Port II are 70 and 100 ◦ . The back-lobe levels for both the horizontal and vertical
polarizations are about

−

22 dB. Compared with the antenna element without the
open-ended SIC, the 3-dB beamwidths are more narrow, the back-lobe levels and
cross polarization levels are improved. The simulated gain of the antenna element
with the open-ended SICs are 7.3 dBi for Port I and 7.15 dBi for Port II, about 2 dBi
higher the gain values of the element without the open-ended SIC.

−